Making PVC Pipe Battery Cells is a little more expensive but well worth it. It is more convenient and produces a lot more power. There are two ways you can do it using the Aluminum as your negative electrode.
You can use aluminum cans soldered together and placed inside of the PVC pipe or you can use expensive Aluminum Rod or bar that you can buy from any hardware store. We suggest using the Aluminum Cans.
The Cells can be as tall as you like 3 foot to 8 foot. But we prefer 24 cells at 6 foot. They can be mounted across a garage wall and each one will have an on off valve located at the bottom of each PVC Cell. Each drain will be connected to a PVC 2″ or so Drain Pipe which can be drained and directed to the out doors. The on and off valves you can buy at any hardware store they are PVC and are cheap.
Cut the Bottoms and tops off of Aluminum Coke Cans. You can solder them together or cut small slits in each can so they can be joined together then you can glue them with silicon, if you glue on the outside of each can then make sure you allow enough space for the can assembly to fit into the PVC pipe. Make sure all can are touching. You may have to sand the printing ink off of the tops of them. Just make sure they are all making a good electrical connection.
Now that you have learned some basics on how to make a homemade battery, the following will show you how to make an even more powerful cell battery, using copper and aluminum sheeting foil or 1/8” thick or less sheeting.
Simply cut as many copper, aluminum and cloth sheets as you can and then piece them together. It is best to drill or punch 2, 1/4” holes into the exact same areas on all of the materials, so you can use 2 wood Dow rods as guides. Cut a 14” x 12” piece of ½”plywood and then drill 2 holes for your Dow rods to go into and glue them into place using glue that can withstand water.
Now place your copper plate down first over the Dow rods and onto the base of the plywood, then 2nd, place your cloth spacer on top of the copper and through the Dow rods. 3rd, place your aluminum sheet over top of the cloth spacer as you did the copper piece. Simply repeat this over and over until you have about 100 pieces all stacked.
Now wrap cloth string around the entire battery to secure it well, then solder and or use bolts to connect all the copper leads and then do the same for the aluminum leads. And you are done, the battery is ready to be placed in a water container and immersed in water.
Several manuals on how to do it by yourself you can find here Energy Efficient [MEGA PACK] – Home Ideas